Glossary

Fear and Greed Index

Plain-language definition Crypto glossary

Key takeaways

The Crypto Fear and Greed Index is a sentiment indicator that condenses the market's emotional state into a single number, typically from 0 for extreme fear to 100 for extreme greed.
It blends inputs such as price volatility, market momentum, trading volume, surveys, and social-media activity into one score that measures mood rather than value.
Many investors treat it as a contrarian signal, on the idea that extreme fear can mark over-selling and extreme greed can mark over-buying, but it is a rough snapshot best used as context.

Definition

The Crypto Fear and Greed Index is a sentiment indicator that condenses the market’s emotional state into a single number, typically from 0 (extreme fear) to 100 (extreme greed).

How it works

The index blends several inputs — such as price volatility, market momentum, trading volume, surveys and social-media activity — into one score. A low reading means investors are fearful and prices may be under pressure; a high reading means optimism is running hot. It measures mood, not value.

Why it matters

Many investors treat it as a contrarian signal, on the idea that extreme fear can mark over-selling and extreme greed can mark over-buying. It is a rough sentiment snapshot, useful as context rather than a standalone trading rule.

Example

After a sharp sell-off, the index often drops into “extreme fear,” while a strong rally can push it toward “extreme greed.”

FAQ

Frequently asked questions

What does the Fear and Greed Index actually measure?

It measures market sentiment, or mood, not the underlying value of any asset. The score blends signals like volatility, momentum, volume, surveys, and social-media activity into a single number from 0 to 100.

How do investors use it as a contrarian signal?

The contrarian idea is that extreme fear can mark a market that has been over-sold, while extreme greed can mark one that has been over-bought. Many investors use it this way as context rather than as a standalone rule for buying or selling.

Should I trade based on the Fear and Greed Index?

The index is a rough sentiment snapshot that is useful as context, not a complete trading strategy on its own. Relying on any single indicator carries risk, so treat it as one input among many; this is educational information and not financial advice.